i like what robert hall said --
you say you found a medium you like --- what do you like about it? the way it can elevate an ordinary thing into something expressive? if so, don't worry about the fact that others have photographed similar things--there's no way around that ..... thing is, they haven't done it with your eyes...... if you just follow your eyes, photography will teach you things about yourself ...... if you're an 'arranger' rather than a 'reactor' when it comes to image making, perhaps a beginning assignment might be to create a photograph that is a metaphor of yourself .... in any event, good luck!